{"id":234261,"date":"2024-09-29T20:26:35","date_gmt":"2024-09-29T20:26:35","guid":{"rendered":"https:\/\/www.emtrion.de\/gpios-on-dimm-rz-a1h-under-linux-2\/"},"modified":"2024-10-24T07:35:39","modified_gmt":"2024-10-24T07:35:39","slug":"gpios-on-dimm-rz-a1h-under-linux-2","status":"publish","type":"page","link":"https:\/\/www.emtrion.de\/en\/gpios-on-dimm-rz-a1h-under-linux-2\/","title":{"rendered":"GPIOs on DIMM-RZ\/A1H under Linux"},"content":{"rendered":"

Please see the following table for the translation from baseboard pin to CPU pin:<\/p>\n

 <\/p>\n

Under Linux you can use sysfs to access gpios.<\/p>\n

To get access to an GPIO pin, first, write the GPIO number to \/sys\/class\/gpio\/export<\/p>\n

echo 83 [gt] \/sys\/class\/gpio\/export<\/pre>\n
Now you should find a directory in \/sys\/class\/gpio to access your GPIO pin. Write ‘in’ or ‘out’ to the direction to change the direction of the pin:<\/p>\n
echo out [gt] \/sys\/class\/gpio\/GPIO0\/direction<\/pre>\n
The value (0 for off, 1 for on) of the pin is in the value file. To read or change it, read the file or write to it.<\/p>\n
echo 1 [gt] \/sys\/class\/gpio\/GPIO0\/value<\/pre>\n
cat \/sys\/class\/gpio\/GPIO0\/value<\/pre>\n
The list of GPIO numbers can be found below.<\/p>\n
 <\/p>\n
<\/a>Verno 3\/Verno 4\/Cadun<\/h2>\n
\n
There are 10 GPIOs on J12 with a signal level of 3.3V and 14 more on J16 via an GPIO expander.<\/p>\n
 <\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Connector<\/th>\nPin<\/th>\nSignal<\/th>\nSignal on RZ\/A1H<\/th>\nPort and pin<\/th>\nGPIO Number<\/th>\n<\/tr>\n
J12<\/td>\n4<\/td>\nGPIO_0<\/td>\nGPIO0<\/td>\n6-3<\/td>\n83<\/td>\n<\/tr>\n
J12<\/td>\n6<\/td>\nGPIO_1<\/td>\nGPIO1<\/td>\n6-4<\/td>\n84<\/td>\n<\/tr>\n
J12<\/td>\n8<\/td>\nGPIO_2<\/td>\nGPIO2<\/td>\n4-0<\/td>\n54<\/td>\n<\/tr>\n
J12<\/td>\n10<\/td>\nGPIO_3<\/td>\nGPIO3<\/td>\n4-1<\/td>\n55<\/td>\n<\/tr>\n
J12<\/td>\n12<\/td>\nGPIO_4<\/td>\nGPIO4<\/td>\n4-2<\/td>\n56<\/td>\n<\/tr>\n
J12<\/td>\n14<\/td>\nGPIO_5<\/td>\nGPIO5<\/td>\n4-3<\/td>\n57<\/td>\n<\/tr>\n
J12<\/td>\n16<\/td>\nGPIO_6<\/td>\nGPIO6<\/td>\n11-12<\/td>\n165<\/td>\n<\/tr>\n
J12<\/td>\n18<\/td>\nGPIO_7<\/td>\nGPIO7<\/td>\n11-13<\/td>\n\n
166<\/p>\n<\/td>\n<\/tr>\n
J12<\/td>\n20<\/td>\nGPIO_8<\/td>\nGPIO8<\/td>\n11-14<\/td>\n\n
167<\/p>\n<\/td>\n<\/tr>\n
J12<\/td>\n22<\/td>\nGPIO_9<\/td>\nGPIO9<\/td>\n11-15<\/td>\n\n
168<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
Please see the following table for the translation from baseboard pin to CPU pin:   Under Linux you can use sysfs to access gpios. To get access to an GPIO pin, first, write the GPIO number to \/sys\/class\/gpio\/export echo 83 [gt] \/sys\/class\/gpio\/export Now you should find a directory in \/sys\/class\/gpio to access your GPIO pin. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"class_list":["post-234261","page","type-page","status-publish","hentry"],"acf":[],"yoast_head":"\nGPIOs on DIMM-RZ\/A1H under Linux - emtrion<\/title>\n<meta name=\"description\" content=\"Learn how to access and configure GPIOs on DIMM-RZ\/A1H under Linux. 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